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1
The precipitated sulphide is soluble in ammonium sulphide.
A Text-book of Assaying: For the Use of Those Connected with Min...
2
It can also be determined as sulphide, by precipitation with sulphuretted hydrogen, the precipitated sulphide being dried at 100° C. and weighed.
Encyclopaedia Britannica, 11th Edition, "Bulgaria" to "Calgary" ...